Carrier-envelope phase-stable $4\mu \mathrm{J}$ pulses at $\sim 1.5\mu \mathrm{m}$ are obtained from a femtosecond Yb:KGW-MOPA-pumped two-stage optical parametric amplifier. This novel technology represents a highly attractive alternative to traditional Ti:sapphire front-ends for seeding multimillijoule-level optical parametric chirped-pulse amplifiers. For this task, we demonstrate stretching of the OPA output to $\sim 40\mathrm{ps}$ and recompression to $33\mathrm{fs}$ pulse duration. As a stand-alone system, our tunable two-stage OPA might find numerous applications in time-resolved spectroscopy and micromachining.

© 2009 Optical Society of America

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